Problems with mods and tracks.

I have some problems with some mods and tracks that i want to have solved..

First the mods...both FSone-2008 and CTDP-2006 have i downloaded multiple times from different sites, and when i klick on the setups it never runs! dont think it has something with my firewall to do because FSone 2006/07 and CTDP-2005 runs perfect!

I cant explain the issue better..both setups just loads forever without even starting the installation!.

And then the tracks...Carrera 4's 1988 tracks does never work for me without a "MAS file error" message when loading the tracks ingame...just dont know how to solve that problem.

I had a problem recently on XP64 OS that would not let me install the latest CoD:WaW patch. The patch was large and the problem was with the version of windows installer I had in Windows. A quick trip to MS downloads and a search for an updated windows installer solved the problem. Apparently some versions of Windows installer have problems with certain file sizes.